A class is only usefull if you are going to need several copies of the same, or you are in desperate need of grouping functions in a very tight manner.
Advantage of a class: it creates it's own environment and scope containing all variables and functions 'pre object'.
Disadvantage of a class: complex to set up, if you get the design wrong you end up with a class-shaped set of functions.
Advantage of seperate functions: you don't have to create an object before you can use the functions, and you can use functions from all libraries at random time.
Disadvantage of seperate functions: each function needs to get all it's data through the parameters and return-values.
